Spectral behavior of a terahertz quantum-cascade laser | Zendy

Joel M. Hensley | Zendy; Juan Montoya | Zendy; M.G. Allen | Zendy; Junzhong Xu | Zendy; Lukas Mahler | Zendy; Alessandro Tredicucci | Zendy; Harvey E. Beere | Zendy; D. A. Ritchie | Zendy

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Spectral behavior of a terahertz quantum-cascade laser

Author(s) -

Joel M. Hensley,

Juan Montoya,

M.G. Allen,

Junzhong Xu,

Lukas Mahler,

Alessandro Tredicucci,

Harvey E. Beere,

D. A. Ritchie

Publication year - 2009

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.17.020476

Subject(s) - laser linewidth , terahertz radiation , optics , materials science , laser , heterodyne (poetry) , quantum cascade laser , optoelectronics , semiconductor laser theory , cascade , photomixing , schottky diode , diode , far infrared laser , physics , chemistry , terahertz metamaterials , chromatography , acoustics

In this paper, the spectral behavior of two terahertz (THz) quantum cascade lasers (QCLs) operating both pulsed and cw is characterized using a heterodyne technique. Both lasers emitting around 2.5 THz are combined onto a whisker contact Schottky diode mixer mounted in a corner cube reflector. The resulting difference frequency beatnote is recorded in both the time and frequency domain. From the frequency domain data, we measure the effective laser linewidth and the tuning rates as a function of both temperature and injection current and show that the current tuning behavior cannot be explained by temperature tuning mechanisms alone. From the time domain data, we characterize the intrapulse frequency tuning behavior, which limits the effective linewidth to approximately 5 MHz.

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